US20010006280A1 - Holder for collar of workpiece or tool - Google Patents

Holder for collar of workpiece or tool Download PDF

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Publication number
US20010006280A1
US20010006280A1 US09/737,020 US73702000A US2001006280A1 US 20010006280 A1 US20010006280 A1 US 20010006280A1 US 73702000 A US73702000 A US 73702000A US 2001006280 A1 US2001006280 A1 US 2001006280A1
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US
United States
Prior art keywords
sleeve
jaws
collar
axially
holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
US09/737,020
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US6419430B2 (en
Inventor
Eugen Hangleiter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Roehm GmbH Darmstadt
Original Assignee
Roehm GmbH Darmstadt
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Roehm GmbH Darmstadt filed Critical Roehm GmbH Darmstadt
Assigned to ROHM GMBH reassignment ROHM GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HANGLEITER, EUGEN
Publication of US20010006280A1 publication Critical patent/US20010006280A1/en
Application granted granted Critical
Publication of US6419430B2 publication Critical patent/US6419430B2/en
Adjusted expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02Chucks
    • B23B31/24Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/26Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle
    • B23B31/261Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle clamping the end of the toolholder shank
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00Component parts such as frames, beds, carriages, headstocks
    • B24B41/04Headstocks; Working-spindles; Features relating thereto
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00Means for securing grinding wheels on rotary arbors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2231/00Details of chucks, toolholder shanks or tool shanks
    • B23B2231/52Chucks with means to loosely retain the tool or workpiece in the unclamped position
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00Chucks or sockets
    • Y10T279/17Socket type
    • Y10T279/17231Pivoted jaws
    • Y10T279/17239Moving-cam actuator
    • Y10T279/17256Reciprocating cam sleeve
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00Chucks or sockets
    • Y10T279/29More than one set of gripping means
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/94Tool-support
    • Y10T408/95Tool-support with tool-retaining means
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/94Tool-support
    • Y10T408/95Tool-support with tool-retaining means
    • Y10T408/953Clamping jaws
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00Gear cutting, milling, or planing
    • Y10T409/30Milling
    • Y10T409/309352Cutter spindle or spindle support
    • Y10T409/309408Cutter spindle or spindle support with cutter holder
    • Y10T409/309464Cutter spindle or spindle support with cutter holder and draw bar

Definitions

  • the present invention relates to a holder for a collar of a workpiece or tool. More particularly this invention concerns a chuck-type fitting adapted to mount a workpiece or tool for rotation for a machining operation, as in a lathe.
  • a holder used with an element such as a tool or workpiece having a mounting collar for rotation of the tool or workpiece about an axis typically has a drive sleeve centered on an axis and shaped to fit coaxially around the collar.
  • a plurality of jaws are displaceable in the sleeve and engageable with the collar to retain the collar in the sleeve.
  • the collar has an inner surface formed with an axially outwardly directed shoulder and the jaws, which have outer ends inside the collar, are formed with axially inwardly directed faces.
  • An actuating element in the holder can spread the jaws to bring their faces to bear axially inward on the shoulders of the collar, and then retract the jaws inward to pull the collar tight to the sleeve. In this manner the collar is locked coaxially to the sleeve so that the sleeve can be rotated to spin the workpiece or tool carrying the collar.
  • Another object is the provision of such an improved holder for a tool or workpiece having a mounting collar which overcomes the above-given disadvantages, that is which allows the tool or workpiece to be secured to the holder without use of the jaws sufficiently that it can be released by the loader.
  • a tool or workpiece having a mounting collar centered on an axis and formed internally with an axially directed shoulder is mounted on a holder having according to the invention a drive sleeve also centered on an axis and fitted coaxially over the collar and a plurality of angularly spaced jaws in the sleeve having axially outer ends each formed with a rearwardly directed face.
  • the jaws are displaceable radially between an outer locking position with their faces bearing axially inward on the shoulder and an inner freeing position with their faces out of engagement with the collar.
  • An axially displaceable actuating member in the sleeve moves the jaws between their inner and outer positions.
  • Axially extending retaining fingers each have a rear end secured in the sleeve and a front end with a rearwardly directed face.
  • the front ends normally lie in an outer holding position with their faces bearing axially inward on the shoulder and the fingers are elastically deformable into an inner releasing position with their faces out of engagement with the collar.
  • these fingers which are a simple structure mounted inside the holder, releasably retain the element—tool or workpiece—having the mounting collar on the sleeve.
  • the element can be snapped onto and off the sleeve without ay actuation of the jaws, allowing the holder to be loaded and unloaded rapidly. Only during the actual machining operation when, for instance, the tool or workpiece is being rotated is it necessary to use the jaws to retain it in place on the holder.
  • the sleeve is formed with a radially inwardly open jaw groove and the jaws have axially inner ends seated in the jaw groove.
  • a spring ring radially outwardly presses the jaw inner ends into the jaw groove.
  • the sleeve is formed with a radially inwardly open holder groove.
  • a ring seated in the holder groove is unitarily formed with the fingers which are angularly interleaved with the jaws.
  • FIG. 1 is a partly diagrammatic axial section through the holder and tool/workpiece in the released condition of the holder;
  • FIG. 2 is an end view of the structure of FIG. 1;
  • FIG. 3 is a view like FIG. 1 but in the clamping position
  • FIG. 4 is an end view of the structure of FIG. 3.
  • a holder 1 much as described in above-cited German patent document 4,138,974 has a drive sleeve 5 that fits around a tubular mounting collar 2 centered on an axis A and forming part of a tool or workpiece 19 adapted to be rotated about the axis A.
  • DIN 69,893 describes the standardized dimensions for the collar 2 .
  • An axially reciprocal actuating rod 4 in the sleeve 5 has an axially outer end formed as an outwardly flared head 3 that can pivot a plurality of holding jaws 6 .
  • the collar 2 has an axially inwardly open seat or cavity 7 internally formed with a frustoconical outwardly directed shoulder 8 engageable with rear faces 9 of the jaws 6 .
  • a retaining element 10 is comprised of a ring 14 fitted in a radially inwardly open groove 13 immediately behind the groove 17 and six retaining fingers 11 extending axially forward from the ring 14 and having front ends formed with rear faces 12 engageable like the faces 9 of the jaws 6 with the shoulder 8 .
  • the element 10 is of an elastically deformable material, for instance steel, and the fingers 11 have beveled outer front ends 18 and are as shown in FIGS. 2 and 4 of equilateral-triangular section, with one apex directed radially inwardly. These fingers 11 alternate with the jaws and their outer ends are radially elastically deflectable.
  • the jaws 6 can be retracted radially inward at the end of a machining operation, but the collar 2 will still be held in place to prevent it from falling off the sleeve 5 .
  • a firm axially outward pull is all that is needed to free the element 19 from the elastic fingers 11 .

Abstract

A tool or workpiece having a mounting collar centered on an axis and for internally with an axially directed shoulder is mounted on a bolder having a drive sleeve also centered on an axis and fitted coaxially over the collar and a plurality of angularly spaced jaws in the sleeve having axially outer ends each formed with a rearwardly directed face. The jaws are displaceable radially between an outer locking position with their faces bearing axially inward on the shoulder and an inner freeing position with their faces out of engagement with the collar. An axially displaceable actuating member in the sleeve moves the jaws between their inner and outer positions. Axially extending retaining fingers each have a rear end secured in the sleeve and a front end with a rearwardly directed face. The front ends normally lie in an outer holding position with their faces bearing axially inward on the shoulder and the fingers are elastically deformable into an inner releasing position with their faces out of engagement with the collar.

Description

    FIELD OF THE INVENTION
  • The present invention relates to a holder for a collar of a workpiece or tool. More particularly this invention concerns a chuck-type fitting adapted to mount a workpiece or tool for rotation for a machining operation, as in a lathe. [0001]
  • BACKGROUND OF THE INVENTION
  • As described in German patent document 4,138,974 filed Nov. 27, 1991 by E. Brangs a holder used with an element such as a tool or workpiece having a mounting collar for rotation of the tool or workpiece about an axis typically has a drive sleeve centered on an axis and shaped to fit coaxially around the collar. A plurality of jaws are displaceable in the sleeve and engageable with the collar to retain the collar in the sleeve. To this end the collar has an inner surface formed with an axially outwardly directed shoulder and the jaws, which have outer ends inside the collar, are formed with axially inwardly directed faces. An actuating element in the holder can spread the jaws to bring their faces to bear axially inward on the shoulders of the collar, and then retract the jaws inward to pull the collar tight to the sleeve. In this manner the collar is locked coaxially to the sleeve so that the sleeve can be rotated to spin the workpiece or tool carrying the collar. [0002]
  • In an automated process the tool or workpiece is mounted on the drive sleeve by an automatic loader which must hold the tool or workpiece in place until the actuator of the holder has spread the jaws. This represents wasted time, as there must be some overlap between when the loader has fitted the tool or workpiece to the sleeve and when the sleeve's actuator is operated. This time could be more productively used by the loader. [0003]
  • OBJECTS OF THE INVENTION
  • It is therefore an object of the present invention to provide an improved holder for a tool or workpiece having a mounting collar. [0004]
  • Another object is the provision of such an improved holder for a tool or workpiece having a mounting collar which overcomes the above-given disadvantages, that is which allows the tool or workpiece to be secured to the holder without use of the jaws sufficiently that it can be released by the loader. [0005]
  • SUMMARY OF THE INVENTION
  • A tool or workpiece having a mounting collar centered on an axis and formed internally with an axially directed shoulder is mounted on a holder having according to the invention a drive sleeve also centered on an axis and fitted coaxially over the collar and a plurality of angularly spaced jaws in the sleeve having axially outer ends each formed with a rearwardly directed face. The jaws are displaceable radially between an outer locking position with their faces bearing axially inward on the shoulder and an inner freeing position with their faces out of engagement with the collar. An axially displaceable actuating member in the sleeve moves the jaws between their inner and outer positions. Axially extending retaining fingers each have a rear end secured in the sleeve and a front end with a rearwardly directed face. The front ends normally lie in an outer holding position with their faces bearing axially inward on the shoulder and the fingers are elastically deformable into an inner releasing position with their faces out of engagement with the collar. [0006]
  • Thus these fingers, which are a simple structure mounted inside the holder, releasably retain the element—tool or workpiece—having the mounting collar on the sleeve. Thus the element can be snapped onto and off the sleeve without ay actuation of the jaws, allowing the holder to be loaded and unloaded rapidly. Only during the actual machining operation when, for instance, the tool or workpiece is being rotated is it necessary to use the jaws to retain it in place on the holder. [0007]
  • According to the invention the sleeve is formed with a radially inwardly open jaw groove and the jaws have axially inner ends seated in the jaw groove. A spring ring radially outwardly presses the jaw inner ends into the jaw groove. Similarly the sleeve is formed with a radially inwardly open holder groove. A ring seated in the holder groove is unitarily formed with the fingers which are angularly interleaved with the jaws. These fingers in accordance with the invention are of triangular section each with a radially inwardly directed corner. [0008]
  • Such construction of the sleeve with adjacent grooves, of which the outer groove holding the jaw inner ends is of larger diameter than the inner groove holding the ring or ring segments carrying the fingers, makes assembly of this holder very simple. In fact the inner end faces of the jaws, which taper axially outward, bear on an outer face of the ring or ring segments carrying the fingers and the latching jaws angularly support the holding fingers. [0009]
  • BRIEF DESCRIPTION OF THE DRAWING
  • The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which: [0010]
  • FIG. 1 is a partly diagrammatic axial section through the holder and tool/workpiece in the released condition of the holder; [0011]
  • FIG. 2 is an end view of the structure of FIG. 1; [0012]
  • FIG. 3 is a view like FIG. 1 but in the clamping position; and [0013]
  • FIG. 4 is an end view of the structure of FIG. 3. [0014]
  • SPECIFIC DESCRIPTION
  • As seen in the drawing a [0015] holder 1 much as described in above-cited German patent document 4,138,974 has a drive sleeve 5 that fits around a tubular mounting collar 2 centered on an axis A and forming part of a tool or workpiece 19 adapted to be rotated about the axis A. DIN 69,893 describes the standardized dimensions for the collar 2. An axially reciprocal actuating rod 4 in the sleeve 5 has an axially outer end formed as an outwardly flared head 3 that can pivot a plurality of holding jaws 6. The collar 2 has an axially inwardly open seat or cavity 7 internally formed with a frustoconical outwardly directed shoulder 8 engageable with rear faces 9 of the jaws 6.
  • There are six such angularly [0016] equispaced jaws 6 each having a rear end 13 engaged in a radially inwardly open groove 17 formed in the sleeve 5. A spring ring 16 bears radially outwardly against these rear ends 15 to keep them in the groove 17 and bias the outer ends of the jaws 6 radially inward into the freeing position of FIGS. 1 and 2. The axially outer ends of the jaws 6 are beveled or tapered so as to be narrower at their radially inner faces than at their outer faces. Thus, as is well known in the art, when the head 3 is retracted inward (to the right in FIG. 1), the jaws 6 are spread so their faces 9 engage the shoulder 8 and pull the collar 2 tightly into the sleeve 5.
  • According to the invention a [0017] retaining element 10 is comprised of a ring 14 fitted in a radially inwardly open groove 13 immediately behind the groove 17 and six retaining fingers 11 extending axially forward from the ring 14 and having front ends formed with rear faces 12 engageable like the faces 9 of the jaws 6 with the shoulder 8. The element 10 is of an elastically deformable material, for instance steel, and the fingers 11 have beveled outer front ends 18 and are as shown in FIGS. 2 and 4 of equilateral-triangular section, with one apex directed radially inwardly. These fingers 11 alternate with the jaws and their outer ends are radially elastically deflectable.
  • Thus when the tool or [0018] workpiece 19 having the collar 2 is fitted to the sleeve 5, the fingers 11 will to start with be cammed inward, but once the collar 2 is fully seated in the sleeve, they will spring elastically outward and their back faces 12 will engage the shoulder 8 with sufficient force to hold the tool or workpiece 19 having the collar 2 on the sleeve 5. If an automatic loader is used it need therefore merely push the collar 2 into place and can then release it, without having to wait for actuation of the rod 4 to actually lock the collar 2 in place by means of the jaws 6. Similarly the jaws 6 can be retracted radially inward at the end of a machining operation, but the collar 2 will still be held in place to prevent it from falling off the sleeve 5. A firm axially outward pull is all that is needed to free the element 19 from the elastic fingers 11.

Claims (4)

I claim:
1. In combination with a tool or workpiece having a mounting collar centered on an axis and formed internally with an axially directed shoulder, a holder comprising:
a drive sleeve also centered on an axis and fitted coaxially over the collar;
a plurality of angularly spaced jaws in the sleeve having axially outer ends each formed with a rearwardly directed face, the jaws being displaceable radially between an outer locking position with their faces bearing axially inward on the shoulder and an inner freeing position with their faces out of engagement with the collar;
means including an axially displaceable actuating member in the sleeve for moving the jaws between their inner and outer positions; and
a plurality of axially extending retaining fingers each having a rear end secured in the sleeve and a front end with a rearwardly directed face, the front ends normally lying in an outer holding position with their faces bearing axially inward on the shoulder and being elastically deformable into an inner releasing position with their faces out of engagement with the collar.
2. The holder defined in
claim 1
wherein the sleeve is formed with a radially inwardly open jaw groove and the jaws have axially inner ends seated in the jaw groove, the holder further comprising
a spring ring radially outwardly pressing the jaw inner ends into the jaw groove.
3. The holder defined in
claim 1
wherein the sleeve is formed with a radially inwardly open holder groove, the holder further comprising
a ring seated in the holder groove and unitarily formed with the fingers, the fingers being angularly interleaved with the jaws.
4. The holder defined in
claim 1
wherein the fingers are angularly interleaved with the jaws and are of triangular section each with a radially inwardly directed corner.
US09/737,020 1999-12-24 2000-12-14 Holder for collar of workpiece or tool Expired - Fee Related US6419430B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29922642.5 1999-12-24
DE29922642U 1999-12-24
DE29922642U DE29922642U1 (en) 1999-12-24 1999-12-24 Clamping device for a hollow shaft

Publications (2)

Publication Number Publication Date
US20010006280A1 true US20010006280A1 (en) 2001-07-05
US6419430B2 US6419430B2 (en) 2002-07-16

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Country Status (5)

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US (1) US6419430B2 (en)
EP (1) EP1118407B1 (en)
JP (1) JP2001225230A (en)
DE (2) DE29922642U1 (en)
ES (1) ES2235744T3 (en)

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US20100301569A1 (en) * 2009-06-01 2010-12-02 Rohr Jr Edward John "Bi-directional quick change tool-less lever and wedge actuated collet chuck, system and/or method for using the same"
CN102950496A (en) * 2011-08-17 2013-03-06 发得科技工业股份有限公司 Broach broaching mechanism
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US9381023B2 (en) * 2011-04-07 2016-07-05 DePuy Synthes Products, Inc. Surgical drill instrument with motor and locking mechanism to receive an attachment and a cutting burr
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US20070167302A1 (en) * 2004-06-14 2007-07-19 Dirk Prust Machine tool and method for changing tools on this machine tool
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EP1118407A1 (en) 2001-07-25
EP1118407B1 (en) 2005-03-16
JP2001225230A (en) 2001-08-21
US6419430B2 (en) 2002-07-16
DE50009787D1 (en) 2005-04-21
DE29922642U1 (en) 2000-02-24
ES2235744T3 (en) 2005-07-16

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